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Yanmar 3GMD - Drive Disc

Yanmar 3GMD
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TRANSMISSION- KM SERIES 213
D-1
~
EJ
to
Inspection
1. Remove the engine from the boat.
2. Remove the transmission.
3. Remove the drive disc (Figure 36, typical).
4. Install the drive disc by revers ing the removal proce-
dure. Install the drive disc
so the side marked
FLYWHEEL
SIDE (Figure 37) is toward the flywheel.
Tighten the drive disc retaining bolls to the torque speci-
fied in Table 2.
Removal/Installatlon
DRIV
E DISC
Replace the drive disc
if
any ofthe followingconditions
exist:
I. Broken spring.
2. Worn or damaged splines in hub.
3. Damaged disc.
4. Damaged pins.
The drive
disc attached to the engine flywheel transmits
power
from the engine flywheel to the transmission input
shaft. Bolts secure the disc to the flywheel while the trans-
mission input shaft engages the splined hub on the drive
disc. The drive
disc incorporates springs that dampen
drivelinc shocks between the engine and transmissio n.
b. Subtract measurement (C,
fo
"igure 34) from substcp
a.
c. Subtract the rear shim thickness (determined in Step
6A) from Step b.
d. Subtract 0.0-0.05 mm from substep c. The result is
the required front shim thickness.
8. Install the shim(s) in the bearing bores in the mount ing
flange and case, then press the bearing ourer races on top
of the shims. Make sure the races are bortomed.
Rear s
him
Front shim
a. Subtract 47.3 mm from measurement (B. Figure
33).
b. Divide measurement (D. Fi
gure
34) by 2.
c. Subtract substep b from substcp a.
d. Subtract measurement (E. Fi
gure
34) from substep
c.
e. Subtract 0.0-0.05 mm from substep d. The result is
the required rear shim thickness.
7. To determine front shim thickness (Figure 35), pro-
ceed as follows:
a.
Add measurement (A,
Figure
32) to measurement
(8 , Figu re 33).
rc
-l

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